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If you look at the way the rear bar is shaped, it's not symetrical to begin with.
The shape of the bar in between the lever arms won't have much of an effect. If you use offset settings, you change the length of the lever arm on one side in comparison to the other.
The average bar rigidity when measured in 1 direction, then the other, will show a median value, but one side will apply more force than the other.
I'm not saying you can't find a practical use for this function. I'm just throwing out the mechanics of it. I run a 350EVO rear bar, and the softest setting is -2% and the next setting up is ~25%. Under the most imbalanced of situations, mine would exhibit a fairly small delta between sides. I'm mostly throwing this out there for those that have the bars with extremely high rates.
